which is just 80 bucks, might not be good to let it run for 24h though but all other oil free running pumps I found are $$$.
I as well found this guy, who is sealing off his vacuum bag and doesn’t have the pump running for 24h (ok, he is doing infusion but that shouldn’t make a difference)
I have heard great things about the used ebay thomas vacuum pumps. its basically 2nd hand refurbished hospital gear that has to be replaced due to regulations from what I read a while ago. check ebay for “thomas vacuum pump”
you can also see how many of them are actually sold on ebay. cant be a bad choice really!